Im thinking mid to late JAN 24? Can do the gold coast but ive done so many times.
Your options may be a bit limited as a lot of places will be booked out already. I’d go to Thailand or Vietnam that time of year but if you don’t want to travel too far there’s a heap of great beach towns on the north, mid-north & south coast. Some might be busy like Forster, Huskisson, Terrigal & around Byron but off the top of my head look at Yamba, Evans head, Brooms head, Old Bar, South west rocks, seal rocks, Huskisson, Tathra, Merimbula, Eden, Belmore